package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.BooleanUtil;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;
public class SimpleLock implements ILock{
    private StringRedisTemplate stringRedisTemplate;
    private  String name;
    private static final String keyPrefix = "Lock:";
    private static final String ID_PREFIX = UUID.fastUUID().toString(true) + "-";
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;

    static {
        UNLOCK_SCRIPT = new DefaultRedisScript();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }


    public SimpleLock(StringRedisTemplate stringRedisTemplate, String name) {
        this.stringRedisTemplate = stringRedisTemplate;
        this.name = name;
    }

    @Override
    public boolean tryLock(long timeoutSec) {
        //获取线程标识(UUID-线程id)
        String threadId = ID_PREFIX + Thread.currentThread().getId();
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(keyPrefix + name,threadId , timeoutSec, TimeUnit.SECONDS);
        return BooleanUtil.isTrue(success);
    }


    @Override
    public void unLock() {
        stringRedisTemplate.execute(UNLOCK_SCRIPT, Collections.singletonList(keyPrefix + name)
                ,ID_PREFIX + Thread.currentThread().getId());
    }

//    @Override
//    public void unLock() {
//        //获取线程标识
//        String threadId = ID_PREFIX + Thread.currentThread().getId();
//        //获取锁标识
//        String id = stringRedisTemplate.opsForValue().get(keyPrefix + name);
//        if (id.equals(threadId)){
//            //标识相同才可以删除
//            stringRedisTemplate.delete(keyPrefix + name);
//        }
//    }
}
